How to Install Vertical Siding over Rigid Foam Insulation?

Two styles of board and batten: This house designed by Kaplan Thompson Architects combines conventional and reverse board-and-batten vertical siding. Its a classic style, but how do you attach the siding over rigid foam insulation?Click To EnlargeTwo styles of board and batten: This house designed by Kaplan Thompson Architects combines conventional and reverse board-and-batten vertical siding. It's a classic style, but how do you attach the siding over rigid foam insulation?

Photo: Kaplan Thompson Architects

An architect in the Rocky Mountain west puzzles over details on a house that is to have an exterior layer of rigid foam insulation and board-and-batten siding. The object is to build in energy efficiency, at a reasonable cost, and stop thermal bridging—as well as find the best means of attaching the siding to the house.

That’s the subject of this week’s

Installing the siding may be the easy part. Strapping screwed or nailed to the framing through the foam will keep everything in place, and provide a rain screen to help the siding stay dry.

But the use of exterior foam on the outside of the building raises other concerns, namely how to prevent the accumulation of water in the wall that would encourage mold and rot. As usual, there are plenty of opinions.

One of those opinions is from GBA Technical Director Peter Yost:

1. Outside the house is the best place for insulation -- not between the studs.

2. For climates with fewer than 20 in. of rainfall, ventilated siding isn't as important as in wetter climates. Although wind-driven rain and snow up the ante a bit.

3. Building code calls for at least 1 in. fastener penetration into studs (which gets complicated with a lot of exterior foam).

at Green Building Advisor


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Some options

1) Legally, if you attach it to your house, it requires a permit. If you build it without a permit and get caught, you'll end up paying twice the permit fees.
2) 12 feet span for you rafters is to much. Under it's own weight, the 2X6's will sag and it will look bad in a year or so. I would go with 2 X 8's and crown each rafter with the crown up.
3) Don't install your 4 x 4 posts directly in the ground like 'fence posts'. It's not legal for one thing and will rot out. You can Use pressure treated posts that are structurally rated, (not all pressure treated lumber is)and use posts base set in concrete

Build it if time permit

For a high quality shed, you need to build it. It cost less than buying a one for the same quality.
Use treated lumber when possible, but only if the nails can handle them. I did that for floor and siding, but not roof sheeting.
For the floor, I would recommend to pour concrete. It's cheaper and last much longer. This is especially you have animals, which you can wash the concrete without issue. You can dig it out, pour gravel and stamp them. Then make a form on top, put mesh metal, and call a company to pour concrete for you.
Build a larger shed. 10x10 is very small

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Related posts:

  1. Vinyl Siding With Foam Insulation
  2. Metal siding Mansfield Ohio
  3. Metal siding Dimensions
  4. Metal Siding Specifications

  • Avatar honesty_counts Why not just use Vinyl Siding instead of Asphalt Shingles? won't It will last much longer?
    Jun 18, 2010 by honesty_counts | Posted in Maintenance & Repairs

    I remember a demonstration of vinyl siding that had a rigid insulation backing, it was shown to be strong enough to walk on without deflecting or being damaged in any way. Every few years (15-20) it seems that homes always need their shingles replaced, but the vinyl siding never gets replaced, so the next time a roof needs to be replaced, why not just use vinyl siding instead?

    • Vinyl siding IS NOT water tight.
      Why shingle are not water proof they are if installed properly "water tight."

  • Avatar Mercy Will this insulation become easily waterlogged?
    Apr 02, 2011 by Mercy | Posted in Do It Yourself (DIY)

    I have plans for a feral cat shelter made from 2" thick rigid styrofoam insulation sheets. It would be easy to make and quite warm. I called Home Depot in advance to be sure they had it in stock and they did. I found … like a fool, but I'm trying to run with this. But is is worth it or should I complain? I mean, I can waterproof the hell out of it. I do know how to do that. But will it hold up if I do, or is this just awful stuff?

    • I think I know the stuff you're talking about... kind of an off-white to yellow board, with a printed metal foil on one face?

      That's insulated sheathing board, usually used to cover a building's framing st … out, it's probably pretty weather resistant, though.

      It isn't compressed fiberglass. It's an air-foamed plastic, like styrofoam. I don't think the guys at Home Depot were trying to pull a fast one on you.

  • Avatar hancockranch Rigid foam, house wrap, both?
    Mar 24, 2008 by hancockranch | Posted in Maintenance & Repairs

    Replacing the siding of a house with very poor insualtion, should I just wrap the house or use rigid foam, or both, or neither under the new siding.

    • Any contractor that puts up insulation and siding can help you with your delima.
      I am getting insulated siding installed on mine. Getting it wrapped is not such a great idea in different climates. Your home needs …xpand and contract. Sometimes in wrapping it only holds in moisture, bacterias and it is not as healthy.

      You might consider getting insulation blown in from the outside walls then plug them off. Good luck!

  • Avatar Rytis Rented room soundproofing?
    Jul 20, 2013 by Rytis | Posted in Do It Yourself (DIY)

    The house that I rent the room has really thin walls so I hear what I don't need to hear. Though I think that the doors is the biggest problem. Any DIY solutions for soundproofing the room, especially the doors without doing any permanent damage?

    • You can buy pink or grey rigid insulation boards from a home store for about $20 each. Lean them up against the walls that you want more sound insulation in. You could accomplish the same thing on the door by cutting and …f the door with bent metal hooks that wrap around the door's top and then drop down on your side of the door and stab into the foam.

      That's the only thing I can think of without putting holes in the walls.

  • Avatar jay c What,s the correct way to insulate a basement stud wall?
    Jan 29, 2009 by jay c | Posted in Do It Yourself (DIY)

    Here is how I planned to insulate my basement walls. First, I would drylock them. Next, I would use dow blue or pink board and glue it directly onto the concrete. This is where I get confused. Should I press the stud wall directly up against the dow board so once I put up the unfaced insulation no air can get it. Or should I leave one inch between the dow board and stud wall to allow the wall to breathe.

    • This is the way it works best for me:
      1-stud wall using 2x2's and 16'" between from stud CENTRE to CENTRE.
      2-Fasten the wood to floor and basement wall with screws using pilot
      holes first usin … 5-Expandable foam works well on the sill plate where the
      bottom of the wall meets the floor.
      Result: warmer floor, drier air, no drafts, better heating
      bills=comfortable and clean basement living.